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docker.go
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docker.go
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package main
import (
"flag"
"fmt"
"github.com/dotcloud/docker"
"github.com/dotcloud/docker/utils"
"io/ioutil"
"log"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
)
var (
GITCOMMIT string
VERSION string
)
func main() {
if selfPath := utils.SelfPath(); selfPath == "/sbin/init" || selfPath == "/.dockerinit" {
// Running in init mode
docker.SysInit()
return
}
// FIXME: Switch d and D ? (to be more sshd like)
flVersion := flag.Bool("v", false, "Print version information and quit")
flDaemon := flag.Bool("d", false, "Daemon mode")
flDebug := flag.Bool("D", false, "Debug mode")
flAutoRestart := flag.Bool("r", false, "Restart previously running containers")
bridgeName := flag.String("b", "", "Attach containers to a pre-existing network bridge. Use 'none' to disable container networking")
pidfile := flag.String("p", "/var/run/docker.pid", "File containing process PID")
flGraphPath := flag.String("g", "/var/lib/docker", "Path to graph storage base dir.")
flEnableCors := flag.Bool("api-enable-cors", false, "Enable CORS requests in the remote api.")
flDns := flag.String("dns", "", "Set custom dns servers")
flHosts := docker.ListOpts{fmt.Sprintf("unix://%s", docker.DEFAULTUNIXSOCKET)}
flag.Var(&flHosts, "H", "tcp://host:port to bind/connect to or unix://path/to/socket to use")
flag.Parse()
if *flVersion {
showVersion()
return
}
if len(flHosts) > 1 {
flHosts = flHosts[1:] //trick to display a nice default value in the usage
}
for i, flHost := range flHosts {
flHosts[i] = utils.ParseHost(docker.DEFAULTHTTPHOST, docker.DEFAULTHTTPPORT, flHost)
}
if *bridgeName != "" {
docker.NetworkBridgeIface = *bridgeName
} else {
docker.NetworkBridgeIface = docker.DefaultNetworkBridge
}
if *flDebug {
os.Setenv("DEBUG", "1")
}
docker.GITCOMMIT = GITCOMMIT
docker.VERSION = VERSION
if *flDaemon {
if flag.NArg() != 0 {
flag.Usage()
return
}
if err := daemon(*pidfile, *flGraphPath, flHosts, *flAutoRestart, *flEnableCors, *flDns); err != nil {
log.Fatal(err)
os.Exit(-1)
}
} else {
if len(flHosts) > 1 {
log.Fatal("Please specify only one -H")
return
}
protoAddrParts := strings.SplitN(flHosts[0], "://", 2)
if err := docker.ParseCommands(protoAddrParts[0], protoAddrParts[1], flag.Args()...); err != nil {
log.Fatal(err)
os.Exit(-1)
}
}
}
func showVersion() {
fmt.Printf("Docker version %s, build %s\n", VERSION, GITCOMMIT)
}
func createPidFile(pidfile string) error {
if pidString, err := ioutil.ReadFile(pidfile); err == nil {
pid, err := strconv.Atoi(string(pidString))
if err == nil {
if _, err := os.Stat(fmt.Sprintf("/proc/%d/", pid)); err == nil {
return fmt.Errorf("pid file found, ensure docker is not running or delete %s", pidfile)
}
}
}
file, err := os.Create(pidfile)
if err != nil {
return err
}
defer file.Close()
_, err = fmt.Fprintf(file, "%d", os.Getpid())
return err
}
func removePidFile(pidfile string) {
if err := os.Remove(pidfile); err != nil {
log.Printf("Error removing %s: %s", pidfile, err)
}
}
func daemon(pidfile string, flGraphPath string, protoAddrs []string, autoRestart, enableCors bool, flDns string) error {
if err := createPidFile(pidfile); err != nil {
log.Fatal(err)
}
defer removePidFile(pidfile)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill, os.Signal(syscall.SIGTERM))
go func() {
sig := <-c
log.Printf("Received signal '%v', exiting\n", sig)
removePidFile(pidfile)
os.Exit(0)
}()
var dns []string
if flDns != "" {
dns = []string{flDns}
}
server, err := docker.NewServer(flGraphPath, autoRestart, enableCors, dns)
if err != nil {
return err
}
chErrors := make(chan error, len(protoAddrs))
for _, protoAddr := range protoAddrs {
protoAddrParts := strings.SplitN(protoAddr, "://", 2)
if protoAddrParts[0] == "unix" {
syscall.Unlink(protoAddrParts[1])
} else if protoAddrParts[0] == "tcp" {
if !strings.HasPrefix(protoAddrParts[1], "127.0.0.1") {
log.Println("/!\\ DON'T BIND ON ANOTHER IP ADDRESS THAN 127.0.0.1 IF YOU DON'T KNOW WHAT YOU'RE DOING /!\\")
}
} else {
log.Fatal("Invalid protocol format.")
os.Exit(-1)
}
go func() {
chErrors <- docker.ListenAndServe(protoAddrParts[0], protoAddrParts[1], server, true)
}()
}
for i := 0; i < len(protoAddrs); i += 1 {
err := <-chErrors
if err != nil {
return err
}
}
return nil
}